Grinding-machine



2 Sheets-Sheet 1. H. B. BEAIRSTO 8v HQS. BEOKWI TH.

Patented Sept. 11, 1894.

- HIM GRINDING MACHINE.

(No Model.)

NORRIS PETERS co. PN 0TO-L THO WASHINOT (No Model.) 2 Sheets-Sheet; 2.

H. B. BEAIRSTO &'H. S. BEGKWITH.

' GRINDING MACHINE.

No. 525,939. Patented Sept. 11,1894.

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HENRY B. BEAIRSTO AND HORATIO S. BECKWITH, OF FORT FAIRFIELD,

MAINE.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 525,939, dated September 11, 1894. V Application filed April 7, 1894- Serial No. 506,678. (No model.)

.To all whom it may concern.-

Be it known that we, HENRY B. BEAIRSTO and HORATIO S. BEOKWITH, of Fort Fairfield, county of Aroostook, State of Maine, have invented an Improvement in Grinding Machines, of which the following description, in connection with the accompanying drawings, is a specification,like letters on the drawings representing like parts.

This invention has for its object to improve the construction of grinding machines especially designed for grinding scythes or cutting blades and also guards of mowing machines, the principal advantage gained being the facility with which the work may be done, particularly when grinding the guards.

The invention consists in a grinding wheel secured to an endwise yielding shaft, supported at the upper end of a stand, the lower end of which is connected bya universal joint to a clamp-like base plate which is adapted to be secured to difierent points of a longitudinal frame bar, and means for securing said stand in any different position at which it may be set, in order that the grinding wheel may be securely held with its acting face turned in different ways, to act upon the cutting blades and guards, and means for rotating said grinding wheel; also in a holder for the scythes or cutting blades which is adapted to receive and permit endwise and also a tilting movement of the blade.

Figure 1, shows in front elevation a grinding machine embodying this invention as adapted for use in grinding the scythe or cutting blade of a mowing machine; Fig. 2, a plan View of the machine shown in Fig. 1; Fig. 3, a detail of the holder for the cutting blade; Fig. 4, a front elevation of the grinding machine as adapted for use ingrinding the guards of a mowing machine, and Fig. 5, a side view of the same.

The longitudinal frame bar a is made of suitable length, and provided at or near each end with a vertical support or arm b, having at its upper end a slotwayb' of sufficient size to receive and permit free endwise and also tilting movement of the cutting blade 0. The cutting blade 0 will be inserted in its holders endwise. The base plate d provided with a clamping screw 01 is adapted to be secured tothe frame bar a, at any desirable point.

The outer edge of said base plate d has a hemispherical socket or recess, and a plate 01 is loosely connected at one end to the outer edge of the base plate d, the inner face of which has also a hemispherical socket or recess, and a clamping screw (1 is provided forsaid outer plate d by means of which it may be moved toward or from the outer edge of the base plate and securely held. The hemispherical sockets or recesses lie opposite each other, and receive the spherical end piece 6, formed upon the lower end of an upright stand 6', the upper end of which is formed to aiford a good and sufficientbearing for a shaft e which is provided at one end with a grinding wheel c and at the opposite end with a toothed pinion e A spiral spring e encircles the shaft 6 bearing at one end against the grinding wheel, and at the opposite end against the bearing, thereby giving to said endwise moving shaft a yielding action. A toothed gear f, is secured to astud supported by the stand e at a point about mid-way its length, which engages a pinion e, and said gear wheel is provided with a hand piece by which it may be turned.

By providing the lower end of the stand with a spherical end piece 6 as shown, and providing a bearing therefor it will be seen that a universal joint is obtained, enabling the grinding wheel to be turned in any different way desired, and by making the bearing of said universal joint as a split bearing, having a clamping screw, it will be seen that the joint may be tightened so as to securely hold the stand in any different position that it may be set.

By making the stand higher than the diameter of the gear wheel, it will be seen that the grinding mechanism may be turned on its universal joint, so that the grinding wheel may act upon the beveled edges of the cutting blades as shown in Fig. 1, and also upon the sides of the guards as shown in Figs. 4 and 5, which latter action it could not accomplish unless so made.

When grinding the guards as represented in Figs. 4 and 5, it is not the intention to use the cutting blade holder. By making the cutting blade holder substantially in the manner shown it will beiseen that the grinding machine may be set at any desired point on the frame bar, and the cutting blade then moved along endwise and also tilted by hand.

We claim- 1. In a grinding machine for mowing machine blades and guards, the combination of a grinding wheel, a spring pressed longitudinally movable shaft therefor, a stand at the upper end of which said shaft has its bearing, means for rotating said shaft, a spherical end piece at the lower end of said stand, and a clamp-like base plate recessed to receive and hold said spherical end piece, thereby forming a universal joint connecting the lower end of said stand with the base plate, substantially as described.

2. In a grinding machine the combination of a grinding wheel,a yielding endwise moving shaft therefor, a stand at the upper end of which said shaft has its bearing, a pinion on said shaft, a gearwheel for rotating it the diameter of which is less than the height of the stand, a clamp-like base plate for said stand comprising two parts each having a hemispherical socket to receive the spherical end piece at the lower end of the stand, and a clamping screw for drawing said parts together thereby securely holding the stand in any different position that it may be set, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HENRY B. BEAIRSTO. HORATIO S. BECKWITH.

W'itnesses:

STEADMAN D. BECKWITH, CHARLES W. TURNB ULL. 

